How does this look?

That looks like a nice setup to me. I don't know about that Sony HU however. I'm not a big fan of anything car audio from Sony. I do have a pair of those Polk coaxials though, and they're great but I'm replacing them with some Focal comps. Check into some nice components instead of coaxials. I haven't ever had the chance to hear those MTX subs before, but I'm sure they will be quite loud in a ported box. Good choice going with a Kicker amp, too, but you WILL need a bigger amp than that for your subs.